ide: replace the global ide_lock spinlock by per-hwgroup spinlocks (v2)
Now that (almost) all host drivers have been fixed not to abuse ide_lock
and core code usage of ide_lock has been sanitized we may safely replace
ide_lock by per-hwgroup locks.
This patch is partially based on earlier patch from Ravikiran G Thirumalai.
While at it:
- don't use deprecated HWIF() and HWGROUP() macros
- update locking documentation in ide.h
v2:
Add missing spin_lock_init(&hwgroup->lock). (Noticed by Elias Oltmanns)
Cc: Vaibhav V. Nivargi <vaibhav.nivargi@gmail.com>
Cc: Alok N. Kataria <alokk@calsoftinc.com>
Cc: Shai Fultheim <shai@scalex86.org>
Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org>
Cc: Elias Oltmanns <eo@nebensachen.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index c55bdbd..504bc94 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -906,7 +906,8 @@
* do not.
*/
- q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
+ q = blk_init_queue_node(do_ide_request, &hwif->hwgroup->lock,
+ hwif_to_node(hwif));
if (!q)
return 1;
@@ -947,7 +948,7 @@
{
ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
- spin_lock_irq(&ide_lock);
+ spin_lock_irq(&hwgroup->lock);
if (!hwgroup->drive) {
/* first drive for hwgroup. */
drive->next = drive;
@@ -957,7 +958,7 @@
drive->next = hwgroup->drive->next;
hwgroup->drive->next = drive;
}
- spin_unlock_irq(&ide_lock);
+ spin_unlock_irq(&hwgroup->lock);
}
/*
@@ -1002,7 +1003,7 @@
ide_ports[hwif->index] = NULL;
- spin_lock_irq(&ide_lock);
+ spin_lock_irq(&hwgroup->lock);
/*
* Remove us from the hwgroup, and free
* the hwgroup if we were the only member
@@ -1030,7 +1031,7 @@
}
BUG_ON(hwgroup->hwif == hwif);
}
- spin_unlock_irq(&ide_lock);
+ spin_unlock_irq(&hwgroup->lock);
}
/*
@@ -1092,17 +1093,19 @@
* linked list, the first entry is the hwif that owns
* hwgroup->handler - do not change that.
*/
- spin_lock_irq(&ide_lock);
+ spin_lock_irq(&hwgroup->lock);
hwif->next = hwgroup->hwif->next;
hwgroup->hwif->next = hwif;
BUG_ON(hwif->next == hwif);
- spin_unlock_irq(&ide_lock);
+ spin_unlock_irq(&hwgroup->lock);
} else {
hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
hwif_to_node(hwif));
if (hwgroup == NULL)
goto out_up;
+ spin_lock_init(&hwgroup->lock);
+
hwif->hwgroup = hwgroup;
hwgroup->hwif = hwif->next = hwif;
@@ -1263,20 +1266,21 @@
static void drive_release_dev (struct device *dev)
{
ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
+ ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
ide_proc_unregister_device(drive);
- spin_lock_irq(&ide_lock);
+ spin_lock_irq(&hwgroup->lock);
ide_remove_drive_from_hwgroup(drive);
kfree(drive->id);
drive->id = NULL;
drive->dev_flags &= ~IDE_DFLAG_PRESENT;
/* Messed up locking ... */
- spin_unlock_irq(&ide_lock);
+ spin_unlock_irq(&hwgroup->lock);
blk_cleanup_queue(drive->queue);
- spin_lock_irq(&ide_lock);
+ spin_lock_irq(&hwgroup->lock);
drive->queue = NULL;
- spin_unlock_irq(&ide_lock);
+ spin_unlock_irq(&hwgroup->lock);
complete(&drive->gendev_rel_comp);
}